Matlab wrapper fails to compile with Boost 1.55 or earlier

Error is newly introduced with pull request #134 due to changes in gtsam.h:

class OptionalPoint3 {
  bool is_initialized() const;
  gtsam::Point3 value();
};

boost::optional function value() is new in Boost 1.56 according to http://www.boost.org/users/history/version_1_56_0.html

Error:

[ 67%] Building CXX object gtsam/CMakeFiles/gtsam_wrapper.dir/__/wrap/gtsam/gtsam_wrapper.cpp.o
/home/cbeall3/git/gtsam/build/wrap/gtsam/gtsam_wrapper.cpp: In function ‘void gtsamOptionalPoint3_value_141(int, mxArray**, int, const mxArray**)’:
/home/cbeall3/git/gtsam/build/wrap/gtsam/gtsam_wrapper.cpp:2914:64: error: ‘class boost::optional<gtsam::Point3>’ has no member named ‘value’
   out[0] = wrap_shared_ptr(SharedPoint3(new gtsam::Point3(obj->value())),"gtsam.Point3", false);
                                                                ^

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